1: \ Number IO
2:
3: \ Copyright (C) 1995,1996,1997,1998,2000 Free Software Foundation, Inc.
4:
5: \ This file is part of Gforth.
6:
7: \ Gforth is free software; you can redistribute it and/or
8: \ modify it under the terms of the GNU General Public License
9: \ as published by the Free Software Foundation; either version 2
10: \ of the License, or (at your option) any later version.
11:
12: \ This program is distributed in the hope that it will be useful,
13: \ but WITHOUT ANY WARRANTY; without even the implied warranty of
14: \ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15: \ GNU General Public License for more details.
16:
17: \ You should have received a copy of the GNU General Public License
18: \ along with this program; if not, write to the Free Software
19: \ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
20:
21: require ./io.fs
22:
23: : pad ( -- c-addr ) \ core-ext
24: \G @var{c-addr} is the address of a transient region that can be
25: \G used as temporary data storage. At least 84 characters of space
26: \G is available.
27: here word-pno-size + aligned ;
28:
29: \ hold <# #> sign # #s 25jan92py
30:
31: : hold ( char -- ) \ core
32: \G Used within @code{<#} and @code{#>}. Append the character
33: \G @var{char} to the pictured numeric output string.
34: -1 chars holdptr +!
35: holdptr @ dup holdbuf u< -&17 and throw
36: c! ;
37:
38: : <# ( -- ) \ core less-number-sign
39: \G Initialise/clear the pictured numeric output string.
40: holdbuf-end dup holdptr ! holdend ! ;
41:
42: : #> ( xd -- addr u ) \ core number-sign-greater
43: \G Complete the pictured numeric output string by discarding
44: \G @var{xd} and returning @var{addr u}; the address and length of
45: \G the formatted string. A Standard program may modify characters
46: \G within the string.
47: 2drop holdptr @ holdend @ over - ;
48:
49: : <<# ( -- ) \ gforth less-less-number-sign
50: \G Start a hold area that ends with @code{#>>}. Can be nested in
51: \G each other and in @code{<#}. Note: if you do not match up the
52: \G @code{<<#}s with @code{#>>}s, you will eventually run out of
53: \G hold area; you can reset the hold area to empty with @code{<#}.
54: holdend @ holdptr @ - hold
55: holdptr @ holdend ! ;
56:
57: : #>> ( -- ) \ gforth number-sign-greater-greater
58: \G Release the hold area started with @code{<<#}.
59: holdend @ dup holdbuf-end u>= -&11 and throw
60: count chars bounds holdptr ! holdend ! ;
61:
62: : sign ( n -- ) \ core
63: \G Used within @code{<#} and @code{#>}. If @var{n} (a @var{single}
64: \G number) is negative, append the display code for a minus sign
65: \G to the pictured numeric output string. Since the string is
66: \G built up ``backwards'' this is usually used immediately prior
67: \G to @code{#>}, as shown in the examples below.
68: 0< IF [char] - hold THEN ;
69:
70: : # ( ud1 -- ud2 ) \ core number-sign
71: \G Used within @code{<#} and @code{#>}. Add the next
72: \G least-significant digit to the pictured numeric output
73: \G string. This is achieved by dividing @var{ud1} by the number in
74: \G @code{base} to leave quotient @var{ud2} and remainder @var{n};
75: \G @var{n} is converted to the appropriate display code (eg ASCII
76: \G code) and appended to the string. If the number has been fully
77: \G converted, @var{ud1} will be 0 and @code{#} will append a ``0''
78: \G to the string.
79: base @ ud/mod rot 9 over <
80: IF
81: [ char A char 9 - 1- ] Literal +
82: THEN
83: [char] 0 + hold ;
84:
85: : #s ( ud -- 0 0 ) \ core number-sign-s
86: \G Used within @code{<#} and @code{#>}. Convert all remaining digits
87: \G using the same algorithm as for @code{#}. @code{#s} will convert
88: \G at least one digit. Therefore, if @var{ud} is 0, @code{#s} will append
89: \G a ``0'' to the pictured numeric output string.
90: BEGIN
91: # 2dup or 0=
92: UNTIL ;
93:
94: \ print numbers 07jun92py
95:
96: : d.r ( d n -- ) \ double d-dot-r
97: \G Display @var{d} right-aligned in a field @var{n} characters wide. If more than
98: \G @var{n} characters are needed to display the number, all digits are displayed.
99: \G If appropriate, @var{n} must include a character for a leading ``-''.
100: >r tuck dabs <<# #s rot sign #>
101: r> over - spaces type #>> ;
102:
103: : ud.r ( ud n -- ) \ gforth u-d-dot-r
104: \G Display @var{ud} right-aligned in a field @var{n} characters wide. If more than
105: \G @var{n} characters are needed to display the number, all digits are displayed.
106: >r <<# #s #> r> over - spaces type #>> ;
107:
108: : .r ( n1 n2 -- ) \ core-ext dot-r
109: \G Display @var{n1} right-aligned in a field @var{n2} characters wide. If more than
110: \G @var{n2} characters are needed to display the number, all digits are displayed.
111: \G If appropriate, @var{n2} must include a character for a leading ``-''.
112: >r s>d r> d.r ;
113:
114: : u.r ( u n -- ) \ core-ext u-dot-r
115: \G Display @var{u} right-aligned in a field @var{n} characters wide. If more than
116: \G @var{n} characters are needed to display the number, all digits are displayed.
117: 0 swap ud.r ;
118:
119: : d. ( d -- ) \ double d-dot
120: \G Display (the signed double number) @var{d} in free-format. followed by a space.
121: 0 d.r space ;
122:
123: : ud. ( ud -- ) \ gforth u-d-dot
124: \G Display (the signed double number) @var{ud} in free-format, followed by a space.
125: 0 ud.r space ;
126:
127: : . ( n -- ) \ core dot
128: \G Display (the signed single number) @var{n} in free-format, followed by a space.
129: s>d d. ;
130:
131: : u. ( u -- ) \ core u-dot
132: \G Display (the unsigned single number) @var{u} in free-format, followed by a space.
133: 0 ud. ;
134:
FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>